I created a course intro video(talking head video), uploaded it into wistia.com then put the video into the course landing page https://aibolik.github.io/30-day-react
So there people can watch intro video, see the table of contents(first 7 lessons) and sign up. Course is not released yet, so I give away for free for all who sign up, so that it can be seen in Udemy that course has enrollers.